Mixing valve



Sept. 28, 1948. G. R. GEMMELL 2,450,128

MIXING VALVE Filed June '7, I946 I fA/vE/v'roe azdo/zikm/r'zel 5yArrow/5y Patented Sept. 28, 1948 UNITED STATES PATENT OFFICE MIXINGVALVE Gordon B. Gemmell, Portland, Oreg. Application June 7, 1946,Serial No. 675,066 I 1 Claim.

This invention relates generally to valves for controlling thetemperature of liquids and particularly to a mixing valve.

The main object of this invention is to provide an exceedingly simpleand efficient form of mixing valve wherein the temperature of water maybe held to a pre-determined temperature regardless of fluctuation in thetemperature of the hot and cold water delivered thereto.

The second object is to produce a device of the class described whichwill be free from delicate or expensive parts and not easily renderedinoperative.

I accomplish these and other objects in a manner set forth in thefollowing specification as illustrated in the accompanying drawing, inwhich:

Figure 1 is a vertical section through the device.

Figure 2 is an elevation taken along the line 2-2 in Figure 1, with thecover plate and control wheel removed.

Figure 3 is a fragmentary horizontal view taken along the line 3-3 inFigure 1.

Figure 4 is an enlarged vertical section taken along the line 44 inFigure 3.

Figure 5 is an end view of the thermostatic element taken along the line5-5 in Figure 1.

Similar numbers of reference refer to the same or similar partsthroughout the several Views.

Referring in detail to the drawing there is shown a water containingcompartment H! having the bottom II, the top l2, the back l3 and thesides M. which are all preferably integral in relation to each other. Acover plate I5 forms a closure for the box and is hermetically sealed bymeans of the gasket I6 and held by the screws l1. Cold water is admittedto the container l through the inlet pipe I8 and hot water is admittedto the container l0 through the inlet pipe [9. The pipes l8 and I9 areprovided with extensions 20 and 2| whose faces 22 are somewhat inclinedin relation to the back l3.

Between the pipes i8 and t9 and on the inner side of the back I3 isformed a post 23 from which extends a pivot bolt 24 upon which ismounted the rocker plate 25 having extensions 26 and 21 formed thereon,said extensions having the inclined faces 28, which are adapted toregister with and seal the faces 22 when brought into contact by arocking movement of the member 25. It will be noted in Figure 2 thatwhen one of the members 26 or 21 is in front of its prospective memberIt or l9, then the other member H3 or I9 is uncovered as is shown inFigure 2.

The cover plate I is also provided with a stuff- 2 ing box 29 containingthe packing gland 30 through which extends the reduced portion 3| of theshaft 32.

On the shaft 32 is mounted a spiral thermostatic element 33, whose end34 is secured to the shaft 32 and whose end 35 is securedto the endmember 26, by means of a rivet 36.

The portion 3| of the shaft 32 has a further reduced area 31 upon whichis mounted the hub 38 of the hand wheel 39 which is indexed to one ofseveral positions by means of the ball detent 40 contained within thecasing 4|,

An outlet opening 42 is formed in the top of the container H] fordrawing the water at the desired temperature.

The operation of the device is as follows: Assuming that hot water isavailable at the pipe I8 and cold water is available at the pipe [3, itis only necesary to turn the hand wheel 39 in the desired direction.This would rotate the shaft 32 and through the thermostatic element 33,it would rotate the rocker plate 25, changing the relationship betweenthe amount of water, which can flow into the compartment II! from thetwo pipes I8 and I9 and thereby changing the temperature of the water inthe compartment Hi, therefore controlling the temperature of the waterwhich flows from the opening 42.

Now, if the temperature of the hot water changes in either direction orthe pressure varies in a manner to effect the thermostatic element 33,then the thermostatic element 33 itself will vary the proportion of thewater inlet areas.

In actual practice it is desirable to provide a plurality of depressions43 in the back of the hub 38 so as to receive the ball detent 40, whichis preferably spring urged.

It can be seen that by this arrangement, any

desired temperature within the range of the min-,

imum cold water temperature and the maximum hot water temperature can beobtained by simply rotating the hand wheel 39 and a perfect mixing ofthe water is obtained thereby.

I claim:

In a device of the class described the combination of a compartmenthaving a pair of inlet openings extending through one side thereof, saidopening having the outlet ends thereof inclined with relation to theaxes of the openings,

a rocker plate having inclined faces formed thereon adapted to formclosures for the respective openings when said plate is rocked to eitherextreme position, a rock shaft journaling in said container having ahand wheel thereon for rotating same, said hand wheel having a detentfor yieldably holding same in a pre-determined position and athermostatic element connected to said rock shaft and to said rockerplate whereby a change of temperature in said compartment will produce acorresponding movement in said rocker plate and a lowering temperaturein said compartment will open the hot water inlet and close the coldWater inlet.

GORDON R. GEMMZEIL.

REFERENCES CITED The following references are of record in file of thispatent:

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